I made a zsphere model yesterday, saved the tool (zspheres still visible), and closed. Today I loaded my tool but I can’t edit it or anything. I understand if the zspheres lost their unique functions, but it doesn’t make sense why I can’t even rotate around the object. What do I need to do to continue editing?
Are you sure you saved the tool and not the document?
Document>Save only saves a 2.5D image. To save the model in 3D you need to use Tool>Save As.
I figured it out. Apparently I needed to draw it on the canvas and when I did it the first time, it got dropped to the 2.5 state.